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Debt (Fair Value of Debt) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Portion at Fair Value Measurement [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Notes Payable, Fair Value Disclosure | $ 5,317 | $ 5,863 | ||||
| Notes Payable, Other Payables, Disclosure | 1,772 | [1] | 1,599 | [1] | ||
| Subsidiaries Term Loan | 1,179 | 0 | ||||
| Loans Payable, Fair Value Disclosure | 2,845 | 2,489 | ||||
| Subsidiaries Notes Disclosure | 0 | 1,075 | ||||
| Debt Excluding Capital Leases | 11,113 | 11,026 | ||||
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Reported Value Measurement [Member]
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||||
| Notes Payable, Fair Value Disclosure | 4,989 | 5,303 | ||||
| Notes Payable, Other Payables, Disclosure | 1,766 | [1] | 1,629 | [1] | ||
| Subsidiaries Term Loan | 1,191 | 0 | ||||
| Loans Payable, Fair Value Disclosure | 2,828 | 2,463 | ||||
| Subsidiaries Notes Disclosure | 0 | 978 | ||||
| Debt Excluding Capital Leases | $ 10,774 | $ 10,373 | ||||
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